74 chips to build 8bit ADC (analog-to-digital converter)

Introduction: This ADC adopts a successive approximation design. The microcontroller uses a parallel port and is accessed by off-chip RAM mapping. It is recommended to use a 51 microcontroller. The circuit structure completely imitates the relevant chapters of the digital and electronics textbook.

Schematic PCB

5G28 operational amplifier

Introduction: A medium-speed operational amplifier made with all discrete components. The circuit adopts the classic op amp "5G28" model from Shanghai Component Factory No. 5 in the 1970s. This model is comparable to the American TL071 model in terms of performance and circuit structure; the size is reduced to 2*2cm and uses DIP-8 connection.

Schematic PCB

5G23 operational amplifier

Introduction: The fully discrete version of the F004/5G23 operational amplifier uses all SMD components and can be directly plugged into the DIP-8 socket.

Schematic PCB

One-click Soviet Hardware Edition

Introduction: One-click Soviets

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TPA3128D2 Class D power amplifier board

Introduction: Class D power amplifier module for TPA3128D2 or other pin2pin compatible chips (thermal pad facing down)

Schematic PCB

Differential probe using JFET

Introduction: There are about 100MHz differential probes

Schematic PCB

Application based on infrared receiving tube

Introduction: I did it out of boredom when the school was closed, and there happened to be a sensor class this semester.

Schematic PCB

Night light (BJT_CC_ADJ)

Introduction: An ultra-low-cost night light that uses a triode as a constant current source to power LEDs. Each unit costs no more than 5 yuan.

Schematic PCB

IF.Ruolalan Sharp Echo Wall Control Panel Five-way Switch Version

Introduction: Laolanjia echo wall control panel five-button switch version

Schematic PCB

ECG simulation

Introduction: Simulates the ECG signal of the human body's single-lead ECG electrode, replacing the real collection during daily ECG debugging.

Schematic PCB

TDA7294

Introduction: TDA7294BTL power amplifier

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capacitor discharger

Introduction: Used to discharge high-voltage capacitors, a necessary tool for switching power supply maintenance personnel

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Low cost power sequencer

Introduction: Power Sequencer

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Fan IoT

Introduction: Household fan modified into smart IoT fan

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RTC6705 image transmission V0.1

Introduction: This is a 150MW image transmission system based on RTC6705 and ERC6659E chips, supporting 30.5mm flying tower installation port

Schematic PCB

RTC6705 Image Transmission 2.0

Introduction: RTC6705 Image Transmission 2.0

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Open Source High Voltage Differential Probe OP5205

Introduction: Continue to open source high-voltage differential probes and turn them into a tool that is easy to use and loved.

Schematic PCB

Infrared speed measurement module

Introduction: Infrared speed measurement module with ambient light suppression

Schematic PCB

12V-150V boost Conv

Introduction: Achieve 12V boost to 150V@100mA through UC3843. The inductor uses a 166125 iron silicon aluminum magnetic ring, with 18 turns of 22uH in the primary and 72 turns in the secondary. 0.3mm winding.

Schematic PCB

PCM1794A

Introduction: HIFI DIY decoding PCM1794A

Schematic PCB